Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival comes with a decrease in the average high-temperature, moving from a chilly 46.8°F (8.2°C) in November to a cold 36.9°F (2.7°C). Mackeyville's December nights cool down to an average low-temperature of 25.9°F (-3.4°C).Humidity
February and December, with an average relative humidity of 84%, are the most humid months.Rainfall
In Mackeyville, in December, it is raining for 10.5 days, with typically 2.48" (63mm) of accumulated precipitation. Throughout the year, there are 164.5 rainfall days, and 33.11" (841mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, in Mackeyville, it is snowing for 8.7 days. Throughout December, 4.41" (112mm) of snow is accumulated. In Mackeyville, during the entire year, snow falls for 49.1 days and aggregates up to 25.55" (649mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:16 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:51 pm EST.
Sunshine
The average sunshine in December is 3.2h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 1 during December translates into these guidelines:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mackeyville in December?
What are the most humid months?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Mackeyville, PA
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).
Average pressure in December
Mackeyville, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Mackeyville, PA
- Average wind speed in December: 6.9mph
The windiest months (with the highest average wind speed) are January and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Mackeyville, PA
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (76%).
Average rainfall in December
Mackeyville, PA
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is November (2.01").
Average rainfall days in December
Mackeyville, PA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
Mackeyville, PA
- Average snowfall in December: 4.41"
The month with the highest snowfall is February (7.4").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mackeyville, PA
- Average snowfall days in December: 8.7 days
The month with the highest number of snowfall days is January (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mackeyville, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Mackeyville, PA
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in December
Mackeyville, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Mackeyville, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in December
Mackeyville, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).
Mackeyville, Pennsylvania, USA
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